20240610 Finished

src/problem/mod.rs

@@ -144,4 +144,5 @@ mod p100_same_tree;
 mod p226_invert_binary_tree;
 mod p101_symmetric_tree;
 mod p114_flatten_binary_tree_to_linked_list;
-mod p112_path_sum;
+mod p112_path_sum;
+mod p129_sum_root_to_leaf_numbers;

src/problem/p129_sum_root_to_leaf_numbers.rs

@@ -0,0 +1,67 @@
+/**
+ * [129] Sum Root to Leaf Numbers
+ */
+pub struct Solution {}
+
+use crate::util::tree::{TreeNode, to_tree};
+
+// submission codes start here
+
+// Definition for a binary tree node.
+// #[derive(Debug, PartialEq, Eq)]
+// pub struct TreeNode {
+//   pub val: i32,
+//   pub left: Option<Rc<RefCell<TreeNode>>>,
+//   pub right: Option<Rc<RefCell<TreeNode>>>,
+// }
+//
+// impl TreeNode {
+//   #[inline]
+//   pub fn new(val: i32) -> Self {
+//     TreeNode {
+//       val,
+//       left: None,
+//       right: None
+//     }
+//   }
+// }
+use std::rc::Rc;
+use std::cell::RefCell;
+impl Solution {
+    fn dfs_sum(node: &Rc<RefCell<TreeNode>>, last_num: i32, result: &mut i32) {
+        if node.borrow().left.is_none() && node.borrow().right.is_none() {
+            *result += last_num * 10 + node.borrow().val;
+        }
+
+        if let Some(left) = &node.borrow().left {
+            Self::dfs_sum(left, last_num * 10 + node.borrow().val, result);
+        }
+
+        if let Some(right) = &node.borrow().right {
+            Self::dfs_sum(right, last_num * 10 + node.borrow().val, result)
+        }
+    }
+
+
+    pub fn sum_numbers(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
+        let mut result = 0;
+
+        if let Some(root) = root {
+            Self::dfs_sum(&root, 0, &mut result);
+        }
+
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_129() {
+    }
+}